Instant Username Search is a free and open-source web app to check if a username is available on services like Facebook, Instagram, Reddit, GitHub and much more. It's available online or as a self-hosted app.

NameOyster is described as 'The global brands of today all seem to have catchy names yet for bootstrapped startups; these short names are expensive to invest in and hard to come by. But a brandable name is not necessarily a short name. Brandables are creative and sticky, but most of all, unique' and is an website. There are five alternatives to NameOyster, not only websites but also apps for Self-Hosted and Windows. The best NameOyster alternative is Instant Username Search, which is both free and Open Source. Other great sites and apps similar to NameOyster are Namechk, KnowEm, NameCheckup and 360username.
Instant Username Search is a free and open-source web app to check if a username is available on services like Facebook, Instagram, Reddit, GitHub and much more. It's available online or as a self-hosted app.

Use Namechk to see if your desired username or vanity url is still available at dozens of popular Social Networking and Social Bookmarking websites. Promote your brand consistently by registering a username that is still available on the majority of the most popular sites.

Search over 550 popular social networks, over 150 domain names, and the entire USPTO Trademark Database to instantly secure your brand on the internet.

NameCheckup is a search tool for available usernames and domains across numerous social networks and popular websites with millions of users. Find available social media handler for your startup, personal brand, business.


360username helps you find, check, and secure the same username across the internet. You can instantly search your preferred name across more than 90 platforms to see where it’s available.



